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en.wikipedia.org/wiki/Cave_of_the_Crystals

Cave of the Crystals or Giant Crystal Cave is a cave connected to the Naica Mine 300 metres (980 ft) below the surface in Naica, Chihuahua, Mexico. The main chamber contains giant selenite crystals (gypsum, CaSO4·2 H2O), some of the largest natural crystals ever found.

en.wikipedia.org/wiki/Naica_Mine

The Naica Mine of the Mexican state of Chihuahua, is a working mine that contains extremely large selenite crystals. Located in Naica in the municipality of  ...

ngm.nationalgeographic.com/2008/11/crystal-giants/shea-text

Dozens of purple and white crystals push up from it like shards of glass. ... Nothing compares with the giants found in Cueva de los Cristales, or Cave of Crystals.

www.answers.com/Q/Where_are_crystals_found

In rocks, mines....practically everywhere. Crystals are found all around the world. One place is in caves where they can be quite large. Geodes contain crystals ...

www.crystalinks.com/mexicocrystals.html

Naica is a lead, zinc and silver mine in which large voids have been found, containing crystals of selenite (gypsum) as large as 4 feet in diameter and 50 feet  ...

sciencing.com/crystals-5640076.html

In fact, almost all minerals occur as crystals naturally, from a grain of salt to an impressive quartz crystal structure. Large quartz and crystal deposits can be found ...

www.quartzpage.de/bergkristall.html

Nov 2, 2009 ... Of course it was already known that rock crystals can also be found at places that never see snow or ice. But the lack of a better theory let the ...

www.tourismontheedge.com/get-extreme/largest-crystals-in-the-world-giant-crystal-cave-mexico

Jan 4, 2013 ... The spectacular Giant Crystal Cave is connected to the Naica Mine, located in Chihuahua, Mexico. 300 meters bellow the surface.

nature.berkeley.edu/classes/eps2/wisc/Lect3.html

A similar, familiar processes is formation of salt crystals by evaporation of sea water. The mineral that forms is determined by what the dissolved elements are.

www.telegraph.co.uk/news/newstopics/howaboutthat/3269047/Worlds-largest-crystal-discovered-in-Mexican-cave.html

Oct 27, 2008 ... Known as Mexico's Cueva de los Cristales (Cave of Crystals) it contains some of the ... The largest crystal found at Naica is 500,000 years old.